Where to Mail forms?

VA FORM 21-0845
The form states I can obtain the VA mailing address of where to send the form, but do I mail it to the Central Office, the Regional Office, or???? not very specific and since we have been waiting almost a year now sending anything to the wrong office would be very frustrating!!!

I mailed my mother's aid and attendance form at the end of October to the Milwaukee Office as directed. I have not received any notification that the application was received. Should I have received a notice the application was received? I tried sending a question via the website but did not get a reply. Anyone know?